. >> actor paul walker's father talks about his son's impact on others as investigators look into the fiery crash that killed the actor and his friend. and new at 4:30 -- >> reporter: we're start to go learn more about yesterday's deadly train derailment here in new york city. i'm marci gonzalez at the scene with the latest. >> and we're taking questions on twitter. you can contact michael at facebook.com/michael abc 7. >> and outside, we go to san jose, highway 87 between 280 and 101. it's cyber monday. maybe they're all inside ordering things on their computer because traffic doesn't look too bad. [s[man] no one told her,right?a. [son]hi! [mom screams] >>> dozens of passengers who were on a flight from austin, texas to phoenix, arizona were exposed to a contagious health condition. a passenger aboard us airways express was not supposed to be flying saturday afternoon because he'd just been diagnosed with tuberculosis. but the airlines did not get that message until after the plane had taken off. once airborne, a flight attendant told a. the man to wear a mask and when the plane land